# What Is the HYG Catalog?

> The data source of every star we sell: an open database merging three real catalogs.

HYG (Hipparcos–Gliese–Yale) merges three real astronomical catalogs into one searchable database of about 120,000 stars with traceable J2000 coordinates, magnitudes, distances and spectral types. Our star library covers 107,838 of them across all 88 constellations.

URL: https://astarnamed.com/guides/hyg-catalog · Category: astronomy · Published: 

## The three sources

- **Hipparcos** — ESA satellite mission — precise positions and parallaxes
- **Gliese** — Nearby-star catalog covering faint, close stars
- **Yale Bright Star** — Bright-star list — the famous naked-eye stars

## How we use it

Positions, distances and spectral types come from HYG; brightness and color columns are cross-checked against Gaia (that is where the gaia_source_id on star pages comes from). The catalog IDs, coordinates and data printed on your certificate are not marketing — they are raw records you can verify in any astronomy app.

- **Version** — HYG Database v4.1, epoch J2000.0
- **Our library** — 107,838 stars · all 88 constellations
- **Data page** — see /our-data for the full account and limits

## The honest boundary

HYG reorganizes public research data; we did not “discover” the stars. Magnitudes and distances pass through several data-processing steps, so an individual star may differ slightly from the newest scientific releases (details on the data page). What we guarantee: every star really exists, is traceable, and is verifiable.

**See the Full Data Page ✦** — https://astarnamed.com/our-data

> See the real star data behind every memorial star → https://astarnamed.com/our-data

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# HYG 星表是什么?

> 我们每一颗星的数据源头:一份合并了三套真实星表的开放数据库。

HYG(依巴谷-格利泽-耶鲁)星表把 Hipparcos、Gliese 与 Yale Bright Star 三套真实天文星表合并为一份综合数据库,约 12 万颗星的 J2000 坐标、星等、距离与光谱全部可溯源。我们的星库收录其中全部 88 个星座的 107,838 颗。

## 三个来源

- **Hipparcos** — 欧空局卫星实测,提供高精度位置与视差
- **Gliese** — 太阳附近的恒星专表,覆盖暗而近的星
- **Yale Bright Star** — 亮星目录,收录肉眼可见的著名恒星

## 我们如何使用它

星位、距离与光谱来自 HYG;亮度与颜色列同时与 Gaia 星表交叉核对(这就是资料页上 gaia_source_id 的由来)。每颗星的编号、坐标与数据都印在证书上——不是宣传语,是可以拿去任何星表软件验证的原始记录。

- **版本** — HYG Database v4.1(J2000.0 历元)
- **我们的星库** — 全部 88 星座 · 107,838 颗
- **数据页** — /our-data 有完整口径与限制说明

## 诚实的边界

HYG 是公开科研数据的再组织,不是我们"发现"的星。星等与距离经过多次数据处理,个别恒星可能与最新科学发布略有出入(详见数据页)。我们保证的是:每颗星都真实存在、可溯源、可验证。

**查看完整数据说明 ✦** — https://astarnamed.com/our-data

> 看每一颗纪念星背后的真实星表数据 → https://astarnamed.com/our-data